Reversing Starters

Electric motors and motor controls are measured by two different standards: the National Electrical Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC). 

NEMA is mostly used in North America and started out by urging manufacturers to use a standard frame size for motor control and lighting applications. Since then, it sees to it that manufacturers design components that meet safety factors and design ratings, as well as oversees the configuration and performance parameters of electrical components. IEC oversees the standards for the European electrical communities. IEC-certified components are now widely being used by companies in North America and are low cost, compact and inherently safe to the users.

NEMA motor starters can be used for a wide range of applications. It is necessary to know the voltage and horsepower of the motor when selecting the proper NEMA motor starter.

Non-reversing motor starters are a 3-phase motor controller with one motor contactor. The contactor opens and closes the power circuit to turn the motor on or off. Reversing motor starters are a 3-phase motor controller with two motor contactors. The motor can be reversed using forward and reverse motor contactors.


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TeSys GB2 thermal magnetic circuit protector, 2 P, 5 A, Id = 66 A
TeSys GB2 thermal magnetic circuit protector, 1 P + N, 20 A, Id = 270 A
Contactor, Definite Purpose, 25A, 4 pole, 20 HP at 575 VAC, 3 Phase, 24/24 VAC 50/60 Hz coil, open
TeSys K IEC contactor, 9 A, 3 P, 5 HP at 480 VAC, nonreversing, 1 NO auxilliary contact, 120 VAC 50/60 Hz coil